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system/libraries/Cache/drivers/Cache_memcached.php

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+<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+/**
+ * CodeIgniter
+ *
+ * An open source application development framework for PHP 4.3.2 or newer
+ *
+ * @package		CodeIgniter
+ * @author		ExpressionEngine Dev Team
+ * @copyright	Copyright (c) 2006 - 2012 EllisLab, Inc.
+ * @license		http://codeigniter.com/user_guide/license.html
+ * @link		http://codeigniter.com
+ * @since		Version 2.0
+ * @filesource	
+ */
+
+// ------------------------------------------------------------------------
+
+/**
+ * CodeIgniter Memcached Caching Class 
+ *
+ * @package		CodeIgniter
+ * @subpackage	Libraries
+ * @category	Core
+ * @author		ExpressionEngine Dev Team
+ * @link		
+ */
+
+class CI_Cache_memcached extends CI_Driver {
+
+	private $_memcached;	// Holds the memcached object
+
+	protected $_memcache_conf 	= array(
+					'default' => array(
+						'default_host'		=> '127.0.0.1',
+						'default_port'		=> 11211,
+						'default_weight'	=> 1
+					)
+				);
+
+	// ------------------------------------------------------------------------	
+
+	/**
+	 * Fetch from cache
+	 *
+	 * @param 	mixed		unique key id
+	 * @return 	mixed		data on success/false on failure
+	 */	
+	public function get($id)
+	{	
+		$data = $this->_memcached->get($id);
+		
+		return (is_array($data)) ? $data[0] : FALSE;
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * Save
+	 *
+	 * @param 	string		unique identifier
+	 * @param 	mixed		data being cached
+	 * @param 	int			time to live
+	 * @return 	boolean 	true on success, false on failure
+	 */
+	public function save($id, $data, $ttl = 60)
+	{
+		if (get_class($this->_memcached) == 'Memcached')
+		{
+			return $this->_memcached->set($id, array($data, time(), $ttl), $ttl);
+		}
+		else if (get_class($this->_memcached) == 'Memcache')
+		{
+			return $this->_memcached->set($id, array($data, time(), $ttl), 0, $ttl);
+		}
+		
+		return FALSE;
+	}
+
+	// ------------------------------------------------------------------------
+	
+	/**
+	 * Delete from Cache
+	 *
+	 * @param 	mixed		key to be deleted.
+	 * @return 	boolean 	true on success, false on failure
+	 */
+	public function delete($id)
+	{
+		return $this->_memcached->delete($id);
+	}
+
+	// ------------------------------------------------------------------------
+	
+	/**
+	 * Clean the Cache
+	 *
+	 * @return 	boolean		false on failure/true on success
+	 */
+	public function clean()
+	{
+		return $this->_memcached->flush();
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * Cache Info
+	 *
+	 * @param 	null		type not supported in memcached
+	 * @return 	mixed 		array on success, false on failure
+	 */
+	public function cache_info($type = NULL)
+	{
+		return $this->_memcached->getStats();
+	}
+
+	// ------------------------------------------------------------------------
+	
+	/**
+	 * Get Cache Metadata
+	 *
+	 * @param 	mixed		key to get cache metadata on
+	 * @return 	mixed		FALSE on failure, array on success.
+	 */
+	public function get_metadata($id)
+	{
+		$stored = $this->_memcached->get($id);
+
+		if (count($stored) !== 3)
+		{
+			return FALSE;
+		}
+
+		list($data, $time, $ttl) = $stored;
+
+		return array(
+			'expire'	=> $time + $ttl,
+			'mtime'		=> $time,
+			'data'		=> $data
+		);
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * Setup memcached.
+	 */
+	private function _setup_memcached()
+	{
+		// Try to load memcached server info from the config file.
+		$CI =& get_instance();
+		if ($CI->config->load('memcached', TRUE, TRUE))
+		{
+			if (is_array($CI->config->config['memcached']))
+			{
+				$this->_memcache_conf = NULL;
+
+				foreach ($CI->config->config['memcached'] as $name => $conf)
+				{
+					$this->_memcache_conf[$name] = $conf;
+				}				
+			}			
+		}
+		
+		$this->_memcached = new Memcached();
+
+		foreach ($this->_memcache_conf as $name => $cache_server)
+		{
+			if ( ! array_key_exists('hostname', $cache_server))
+			{
+				$cache_server['hostname'] = $this->_default_options['default_host'];
+			}
+	
+			if ( ! array_key_exists('port', $cache_server))
+			{
+				$cache_server['port'] = $this->_default_options['default_port'];
+			}
+	
+			if ( ! array_key_exists('weight', $cache_server))
+			{
+				$cache_server['weight'] = $this->_default_options['default_weight'];
+			}
+	
+			$this->_memcached->addServer(
+					$cache_server['hostname'], $cache_server['port'], $cache_server['weight']
+			);
+		}
+	}
+
+	// ------------------------------------------------------------------------
+
+
+	/**
+	 * Is supported
+	 *
+	 * Returns FALSE if memcached is not supported on the system.
+	 * If it is, we setup the memcached object & return TRUE
+	 */
+	public function is_supported()
+	{
+		if ( ! extension_loaded('memcached'))
+		{
+			log_message('error', 'The Memcached Extension must be loaded to use Memcached Cache.');
+			
+			return FALSE;
+		}
+		
+		$this->_setup_memcached();
+		return TRUE;
+	}
+
+	// ------------------------------------------------------------------------
+
+}
+// End Class
+
+/* End of file Cache_memcached.php */
+/* Location: ./system/libraries/Cache/drivers/Cache_memcached.php */